If this setup worked fine with a dome and DirecTV, it should work exactly as well with a dome and DISH.
What has changed? What antenna? Have you done the required Check Switch routine? Are you sure you are not blocked? The DISH satellites are in a dramatically different location. If you have a dome and it was set for DTV, have you changed the antenna setting to DISH? Is the dome older than 2016? The older domes can no longer receive DISH programming.
Get us some additional details.
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?